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Title: fix: wrap pipe union structured outputs by he-yufeng · Pull Request #2669 · modelcontextprotocol/python-sdk · GitHub

Open Graph Title: fix: wrap pipe union structured outputs by he-yufeng · Pull Request #2669 · modelcontextprotocol/python-sdk

X Title: fix: wrap pipe union structured outputs by he-yufeng · Pull Request #2669 · modelcontextprotocol/python-sdk

Description: Summary use Pydantic's explicit (annotation, ...) field form for wrapped structured outputs add a regression test for PEP 604 unions that include container types Fixes #2591 To verify .\.venv\Scripts\python.exe -m pytest tests\server\mcpserver\test_func_metadata.py::test_structured_output_generic_types -q .\.venv\Scripts\python.exe -m pytest tests\server\mcpserver\test_func_metadata.py -q .\.venv\Scripts\python.exe -m ruff check src\mcp\server\mcpserver\utilities\func_metadata.py tests\server\mcpserver\test_func_metadata.py .\.venv\Scripts\python.exe -m py_compile src\mcp\server\mcpserver\utilities\func_metadata.py tests\server\mcpserver\test_func_metadata.py git diff --check

Open Graph Description: Summary use Pydantic's explicit (annotation, ...) field form for wrapped structured outputs add a regression test for PEP 604 unions that include container types Fixes #2591 To verify .\.ven...

X Description: Summary use Pydantic's explicit (annotation, ...) field form for wrapped structured outputs add a regression test for PEP 604 unions that include container types Fixes #2591 To verify .\...

Opengraph URL: https://github.com/modelcontextprotocol/python-sdk/pull/2669

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24ffb7c fix: wrap pipe union structured outputs he-yufeng May 23, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2669/commits/24ffb7c42c1f510841f550020feed3ead1fecf83
e19b18a test: fix pipe union CI coverage he-yufeng May 23, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2669/commits/e19b18a9a907f4f1fc6702d447afd4e30e2eb118
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